What percentage of traffic on the pstn is speech telephony

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Name at least three services other than speech telephony that already had been integrated into the PSTN prior to the advent of ISDN ? Identify at least two shortcomings of PCM as implemented today regarding its suitability for ISDN. (Hint: Think standards.) ? PCM, as designed, is optimized for speech telephony. Approximately what percentage of traffic on the PSTN is speech telephony?

Reference no: EM131301598

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